Dynamo-electric machine.



W. H. POWELL & R. B. WILLIAMSON. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED NOV. 21, 1910. ,TE Q5QL 5Q, Patented Jan. 21, 1913.

vsinrirns' PATENT carton.

WILLIAM H. POVIELL AND ROBERT E. \VILLIAMSGN. OF IVIILWAUKEE,-WISCONSIN, ASSIGNOES TO ALLIS-DHALMERS COMPANY, A CORPORATION OF NEWJERSEY.

DYNAMO-ELECTRIC MACHINE.

a mless.

of Wisconsin, have invented certain new and.

useful Improvements in Dynamo-Electric Machines, of which the followingis a full, clear, and exact specificatlon.

(Eur invention relates to dynamo-electric machines, and particularly tothe ventilation of the rotating members thereof.

in the operation of dynamo-electric inachines considerable'heat isdeveloped. In order to carry away this heat, various schemes ofventilation have been proposed,

and have operated with more or less success. It is the object of ourpresent invention to improve upon the existing ventilating schemes,having particular reference to the wntilation of rotors.

In carrying out our invention the rotor is provided with longitudinalslots open at the periphery of the rotor at the central portion thereofbut closed at the periphery near the end portions thereof. These slotsare also open at their ends, preferably at some distance radially inwardfrom the periphery, so that air may be drawn inward through the openingsin the ends, may flow lengthwise of the slots toward the center, andpass out of the slots through the openings at the central part of theperiphery. In case the rotor is the field member, these slots arepreferably located in the field poles.'

The various novel features of our nven tion will be apparent from thedescription and drawings,"a11d will be particularly pointed out in theclaims.

Figure 1 is a partial longitudinal section through a dynamo-electricmachine embodying our invention; and F ig. 2 is a partial sectionthrough the rotor on the line 2-2 of Fi 1.

lhe stator windings 9 are embedded'in slots in the laminated stator core10, which is clamped between end plates 11 and supported on ribs 12 of astator frame 13: The stator core is provided with spaces 14 betweengroups of laminations and spaces 15 between the core and the end plates.A circulation of air may be maintained through these spaces in anydesirable manner.

7 Specification of Letters Patent. Application filed November 21, 1910.Serial No. 593,350.

Patented Jan. 21,)13.

0n the shaft 16 is mounted the core 17. This core may be built in anydesired fashion, in the case illustrated comprising a number of disksassembled on the'shaft and clamped between nuts 18. The rotor windings19 are located in slots in the core 17 and held in place by wedges 20,as,clearly shown in Fig. 2. The portions of the windings '19 whichproject beyond the endsmif the core 17 are supported in any suitablemanner, as by end bells 21 mounted on end disks 29. Fans 2'2, preferablymounted on such end disks. furnish the air for the ventilation of I thestator, drawing it in, in the now well known fashion, through anadmission chamber 23 open at the bottom.

The field coils 19 are so arranged in the core 1? thatrthey form one ormore pairs of field poles 24. the machine shown being a four polemachine. These field poles 24 are 0 passageways trom spaces 27 undersuch end are connected,

turns. 'lhesc spaces 27 through openings 28 in the end disks 29, to theadmission chambers '23. Continuous passageways are thereby formed fromadmission chambers 25 through the slots 25.

In the operation of the machine, the rotor by its rotation draws in airfrom the chambers' -23, through the openings 28 and the 27, int 0 theslots 25, the air then flowing lengthwise through the slots to themiddle portion of the rotor and passing out at such midflle portionthrough the peripheral openings of the'slot-s into the air gap be tweenthe rotor and the stator. The air spreads out thiwugll this air gap, andes-. capes into the spaces associated with the stator core 10, passingthence into the champrovided with longitudinal slots 25 extendber 30,which open to the atmosphere at and all such which do not involve a.departure from the spirit and scope of our invention we aim to cover inthe following claims.

'hat we claim asnew is: l. A rotor of a dynamo-electric machine,comprising a core having pole faces with longitudinal slots open at theperiphery oi? the rotor only near the middle thereof and open at theends of the rotor core at their radially innermost portions.

2. A rotating tield member ot a dynamoeleetrie machine, comprising alongitudinally slotted core having pole faces, field windings located insome of said slots, others of said slots being-in the pole faces andopen at the periphery of the eore only near the middle of the rotor andat the ends of the core at their radially innermost portions.

3. A. rotating field member of a dynamoeleotric machine, comprising alongitudinally slotted core, the slots extending inward from theperiphery of theteore, field windings located in some of. said slots andpartially closing the ends of others of the slots,

and wedges for closing the peripheral openings of said other slots nearthe ends of the rotor core.

4. A rotating field member for dynamoeleet rie mach ines, comprisinglield poles, t'ield windings associated with said field poles, saidfield poles being longitudinally slotted having longitudinal slots inits periphery,

field windings located in certain of said slots, others of said slotsbeing in the faces of the iield' poles within such windings, solidetflges for partially closing the peripheral openings of the slots inthe field poles, said slots in the field poles being open at their endsto a source of air supply.

(i. A rotating field member of a dynamof eleetrie machine, having fieldpoles provi d with longitndinalslots in the pole faces, anti imperforatel'neans for partially closing the facial openings of said slots.

Illilwaulure, Wis, Nov. 15, 191.0. I Iln testimony whereof we afiix oursignatnres in the presence of two witnesses.

\V] liL'I AM ll. POW 1' LL. ROBERT B. \VILIJAMSOX V it messes:

(i. B. Scrum, ins. L. BYRON.

